Contrast introduce unified configuration center

A, Apollo, and the center of Comparative arranged Spring Cloud Config

Two, apollo compared to the spring-cloud-config What are the advantages

https://github.com/ctripcorp/apollo/wiki/FAQ#9-apollo%E7%9B%B8%E6%AF%94%E4%BA%8Espring-cloud-config%E6%9C%89%E4%BB%80%E4%B9%88%E4%BC%98%E5%8A%BF